How to Compress Image to 100KB on Phone: iOS & Android

To get a photo under 100KB on your phone, open the FixDoks Compress Image to 100KB page in your phone browser, choose the photo and download the result. No app is needed: it works in Safari on iPhone and Chrome or Samsung Internet on Android. The tool keeps the best quality that still fits under 100KB, and it works with JPG, PNG, WebP and HEIC photos.

Try it here

Compress to 100 KB, right on this page

Tap to pick a photo from your gallery. The result stays at or under 100 KB.

Runs in your browser. Your file never leaves your device. Open the full Compress Image to 100 KB page

Before you start

Find out what the form actually asks for. Some portals want a photo between a minimum and a maximum size, not just under 100KB, and some name a file format or pixel size. Read the instructions on the upload screen or in the notification first, then compress to match. If the form wants an exact pixel size as well, resize the photo before you compress it.

Compress on iPhone using FixDoks

1. Open Safari or Chrome on your iPhone.
2. Go to fixdoks.com/compress-image-to-100kb/ in the address bar.
3. Tap the upload area, then tap 'Photo Library' to pick your photo from the Photos app.
4. Wait for the compressor to finish, then check the size it reports for the result.
5. Tap the download button. Downloading needs a free Google sign-in, and the sign-in also lets you keep the file in My Files.
6. Safari saves the file to the Downloads folder in the Files app.
7. Go back to your form, tap upload, find the file in Downloads or Files, and re-upload it.

iPhone tip: shoot JPG instead of HEIC

Newer iPhones save photos as HEIC by default, and some portals reject that format. You can switch the camera to JPG for photos you take from now on.

1. Open Settings and tap Camera.
2. Tap Formats.
3. Select Most Compatible. New photos will now be saved as JPG.

This only affects photos you take after the change, and it does not shrink a photo to 100KB. Photos already in HEIC stay as they are, so compress them with the FixDoks tool above. Apple explains the setting on its support page for HEIC and HEVC formats.

Compress on Android using FixDoks

1. Open Chrome or Samsung Internet on your Android phone.
2. Go to fixdoks.com/compress-image-to-100kb/ in the address bar.
3. Tap the upload area, then choose 'Gallery' or 'Photos' to pick your image.
4. Wait for the compressor to finish and check the size it reports.
5. Tap the download button. Downloading needs a free Google sign-in.
6. The file is usually saved to the Downloads folder, though this depends on your browser settings.
7. Go back to your form, tap upload, navigate to Downloads, and select the compressed image.

Why a dedicated compressor helps

Re-saving or sharing a photo from the gallery does not aim for a specific size, so you only find out the result after trying. The FixDoks page is built for one target: it keeps the best quality that fits under 100KB. Many portals check the size automatically, so always confirm the final file is under the limit in your file manager before you upload.

What to do if the file is still over 100KB

• Check that you picked the right photo. A common slip is selecting the original instead of the compressed copy.
• Crop the photo tighter before compressing. A head-and-shoulders crop has fewer pixels than a full-body shot, so the file is smaller.
• If the source is a large screenshot or a PNG, resize it first with the image resizer, then compress again.
• Try again from the original photo rather than a copy that was already compressed.

Checking your downloaded file size on phone

After downloading the compressed image, you can check its size to confirm it is under 100KB:

iPhone: Open the Files app, press and hold the image, and tap Get Info. The size is listed there. If you need help converting HEIC files on iPhone first, see the HEIC to JPG guide.

Android: Open the file manager (My Files on Samsung, or Files by Google), navigate to Downloads, long-press the image and open its details or properties. The menu name differs between phone brands.

Common mistakes when compressing on phone

• Downloading the image but forgetting to open it again when re-uploading to the form. Do not re-upload the original photo by mistake.
• Trusting the preview: always check the actual KB size in the file manager.
• Assuming your phone's default camera photos are already small enough; phone camera photos are often several MB, far above 100KB.
• Cutting it too fine: a file at 100KB or just above can be rejected, so aim for a little under the limit if the tool allows.

If the form accepts only specific file formats

Many portals accept JPG or JPEG, but some list other formats, so read the help text or notification on the form. The FixDoks 100KB page works with JPG, PNG, WebP and HEIC photos, and the tool description says it keeps the best quality that fits under 100KB. If your form needs a PDF instead, see the guide on compressing a PDF to 100KB on your phone.

For the full list of image sizes, you can also read the main compress image to 100KB guide.

Tools for this

Frequently asked questions

Sources

• Apple Support: HEIF and HEVC media on Apple devices (checked 2026-10)
• FixDoks Compress Image to 100KB tool page (checked 2026-10)

Rules and limits change. Always check the latest official notification or portal before you submit a form.